Variations to calcareous nannofossil CaCO3 content during the middle Eocene C21r-H6 hyperthermal event (~Â 47.4Â Ma) in the Gorrondatxe section (Bay of Biscay, western Pyrenees)
Keywords: لیسولین; Acidification; Lysocline; Coccolith; Carbonate mass; Image analysis; Eocene;